Collistar Special Perfect Body Volumizing Oil-Serum Bust, 75 ml, Products for Bust and Décolleté for Women, Collistar Special Perfect Body Volumizing Oil-Serum Bust tightens the skin of your bust and chest to make it firmer. Characteristics: firms the skin of the bust hydrates deeply regenerates increases elasticity and keeps skin soft How to use: Apply to the whole chest and bust area using gentle circular movements. Leave to become absorbed.